diff --git a/src/config_passthrough.cpp b/src/config_passthrough.cpp
index 3da1e1ea..6155130b 100644
--- a/src/config_passthrough.cpp
+++ b/src/config_passthrough.cpp
@@ -24,7 +24,7 @@ template<>
 std::string
 Passthrough::to_string() const
 {
-  BE_Passthrough x;
+  BE_Passthrough x = BE_Passthrough::off;
 
   return x._to_string();